i have a virgin 1275 block (bare with end caps), 2x 1275 cranks (one needs polishing and one needs regrinding) and 040 flat top pistons and i was wondering roughly how much they are worth as i am thinking of selling them, or should i get some s rods and a head. also if i do use the 1275 engine are the gearboxes the same as the 998 ones?

A 1275 block (non S) and caps, std bore- probably worth $300-400.
Cranks- it depends on sizes they are now. Measure them. Get them cracktested too, as many now have cracks in.
Pistons if S/H are worth zip really.

A 4 synchro box is the same whether it has a 1275 on it or a 998-1098. 1275 will drop straight on and clear. Just use a 1275 primary gear.
This applies whether it's a remote, or rodchange.

Many 3 synchro boxes need a bit of a grind to clear the crank, but the real early ones (850)- forget it.
These days for ease of use on the road and parts availability I would forget any 3 synchro box, anyway.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.