Question about 340 vs. 440 (From newbie)

How much power your looking for ? Is good street manners a concern, do you mind running deep rear gears and lot of stall ?

340/360 can make a good 350-450 hp add a 4” or go big block for 450-550 hp anything above that is generally big block territory. Obviously that’s not set in stone, you can build a 350 plus hp 440 for car if you wanted to would have the advantage of being more streetable especially if you put it on a diet.