In that case your mini
is slow

A properly ported, cammed and carbed mini is a pretty pokey thing to say the least, esp when you're running a big block 1275 or greater.
Not sure about the state of your engine, but I bet that if you did a bit of fiddling here and there, say put a kit through your carb, dyno tuned the carb to make sure it's running at optimum, making sure the timing is spot on etc you'd gain quite a few horses right there and then.
If I were you, the next few steps would be to throw in an LCB and RC40 exhaust if you haven't already got extractors, think about maybe twin 1 1/2 SUs or 45webber/dellorto, RE13 cam and 1.5 rockers, in that order. It should make the little thing fly!
Actually, I can't believe that it doesn't already fly... by the sounds of it
at least 60bhp at the wheels is certainly achievable with what you have?? I run at somewhere near 50hp and I think Lillee is at least pokey... at least for sure can keep up with my friend's (GT4 shaped) celica

Actually no joke through the back streets of my area (roundabout heaven) I give my friend's Skyline GTSt a run for his money

but then he drives like a granny
