Its a sunny day mid 60,s. and I have really been taking advantage of it. no firewood to cut. caughtup on most everything. So today I went to work on my 71. The valve seat came loose and the 402 dropped a valve and destroyed a piston and cracked the cyl wall. I already have a low deck 454 I pulled from a 78. So today I got busy and pulled out the 402 and stripped all the parts needed to install the 454. things like engine mounts brackets & pulleys ect. The 454 already has the proper flywheel. got the 454 stripped and quit for the day. I going to get some degreaser and oven cleaner and clean up the 454 and the engine bay and chassis on the 71. I left the turbo 400 trans in the truck. And took out the 402 engine without removing the hood. plenty of room. haven't decided whether to go back with the factory cast iron manifolds or a set of hedders thatI already have. The exhaust on the truck now is small 2 inch pipes and glass packs. I want to install turbo mufflers & bigger 2&1/2 inch pipes the 454 has square intake port heads with a edelbrock dual plane high rise intake. at least the gas is cheap enough to afford to drive a truck with 456 gears and a big block engine!