It all depends on what rear end your 73 dart came with to withstand the 340. If it has an 8.25 rear should be fine but a 7.25 will not last long at 400hp. Dustin
Thanks so much. I will get specifics on the drivetrain. And the auto tranny should be fine? If I buy a solid 73 right, is it a good idea to put a 340 in it and try to muscle it up.. some Mopar buds act like nothing good was built in 73.. your views?