I'd go with the stroker. The 3.75 stroke 451 or 3.9 stroke 470 make great combos with decent height pistons and rod ratio for durability. Top it off with mildly ported Edelbrock or Stealth heads and a cam in the 230-240 @.050 intake range and you should have 450 to 500 torquey and streetable HP. Compression ratio in the low to mid 10's with quench should be very happy with pump gas.