okay I have to put my 2 cent in here..... putting a stock 460/429 in this truck would not cost that much.... motor mounts (was about 200 bucks prbably less now) a 400m bell housing and a 390 flywheel you will have to buy all this except the motor mounts on any other motor change.. the 460 will be a power house... I have had 5 400's and 3 360's and 4 460's non of them could hold a light to the stock 460 (one of the 400 was 30 over) it's basically what you can find cheep and want..