Hi Grouch
Just thought I'd relate my experience as I did a similar thing and sold my reliable old Corolla and early this year bought a highly modified "68 Deluxe for my daily (I'm currently restoring a "64 van and an 850 sedan and I wanted one I could drive now).
The car came with disk brakes, a worked 1100 with 4 synchro remote gearbox and KAD quickshift, a modern fusebox, halogen headlights and relays, a Suzuki alternator, electronic ignition, dry subframes (originally it was a hydro car), Cooper S deep-dish mags, a walnut dash with tacho, speedo, oil pressure, water temp and battery charge gauges and the list goes on.
It also came with the original 998 motor and a spare dry rear subframe.
I paid $6650 delivered but unregistered from a guy in QLD who had it 5 years and used it as his daily and for motorkhanas on the weekends.
This seems cheap but as another member mentioned, it had a few things that had to be done over and above the rego, inspection fees and insurance that in themselves were ~$1000.
Since I bought it the following has been added to it, some of which I could've lived without but I wanted it to be a nice experience when I drive it so I spent the money;
New battery, new rear flipper window seals (L and R), new front headlight rubber ring seals, new gearshift boot and retainer ring, new Falken 165/70/R10 tyres, KBS rustguard and bitumen soundproofing on floorpan under carpet, new carpet, new front tinted windscreen and windscreen rubber, new rear windscreen rubber, new boot rubber (on-body, a refurbished carburettor (HS4), new K and N cone air filter and 1.5” stub stack, new Smiths speedo and speedo cable, firewall and bonnet soundproofing, new indicator stalk-(on steering column), new Smiths analogue dash clock and new clutch and brake master cylinders.
All this cost an extra $2000 and the car still has a slightly crunchy third gear (I quickly learned to double clutch), door windows that need attention and a crappy paintjob but is rust free except for a 5 cent piece sized hole in the rear beaver panel.
I do keep the maintenance up in terms of changing the oil, greasing everything, bleeding the brakes etc but I've found it to be unbelievably reliable and fun to drive and I wouldn't go back to a "modern" car again.
I also like the fact that it looks a bit rough as I would hesitate to leave a really nice mini parked out and about in case it got dented or scratched.
Here's a couple of pics of what it currently looks like;




I keep finding things on this car that have been upgraded and it has obviously had thousands of dollars spent on it even before I bought it.
My advice would be to look around and find a car that has a lot of work already done to it -you'll always find someone that has overspent and is ready to sell but can't recoup the money (me included!!) as the market value is just not there.
Hope you find yours and enjoy it as much as I do with this little beasty
Regards Dave