[Dimis]

If I was in your shoes and considering a combination to go autoX and street cruising then I'd probably consider this shopping list of parts: an Alu Pond (or BBM) block stroked 468cubes (4.125 stroke), with a BT MR dual quad intake and some matching heads either Pond, BBM, or Survival.

I'd then take them to Brent (or Barry) and ask them to kit together the lightest valve train, crank, piston and rod combo, and to cam the thing accordingly to achieve the fastest reving (NOT highest reving) motor with a smooth and linear power-band.

This would be my approach. I however am no expert!

PS: this wouldn't be the cheapest way... but as the old adage goes: FAST, RELIABLE, CHEAP - pick any 2