Along with power you will also see an increase in mileage (thats is if you can keep your foot out of it).
Harness strip with a good tune is $499 US, fuel pump etc can be had out of the wreckers, fuel line/pressure reg. add $200. The stock rad is fine. The two hardest parts is adapting the engine mounts and installing the fuel system.
I guess what we are getting at here is this, if your building a 250 for power its going to be equal $$ to doing the swap. I know as I did originally build a 292, I which I had spent that money buying the 4200 in the first place but at that time very few people had done anything with the 4200.
Last edited by efi-diy; 12/29/14 10:45 PM.
