stroker 340??

Your best bet cost wise would probably be just find a 360 you can rebuild. The 318 is a good motor but if you are gonna build something fast might as well take advantage of the extra cubic inches and the 360s are easy to find and cheap. The 340 would be cool to but expect to spend a chunk of money just for a good core motor around here i can buy 360s complete for 100-200 bucks and i think 340s that are mostly there are gonna be in the 800-1000 range usually. Good Luck with the build Justin