I put a 351-W/C-4 in it and I never liked the way the motor ran so I decided to build me a Y block to put back in it,found a complete 56 292 4 bbl motor for 100 dollars and just picked up a 67 FMX trans for 30 dollars so as soon as I get my 66 F250 finished I will start on the Y block. I still need a couple parts like a 59 flywheel and a valley pan from a 62 to 64 truck so I can use a PCV valve plus a 57 to 64 distributor and a FOM air cooled bellhousing so I can make the FMX look like the original trans and get it mounted to the 292,the FMX has a rear pump so I think it can be push started in case of dead battery or starter problems and I can use the original type starter so it sounds like a Y block when starting. I am still thinking about what cam I am going to use and all that other stuff but got plenty of time as there is no hurry since I can still drive it.