i have a 61 apache with a 350 in it. it was a 6 but already converted when i got her.it fits fine with rams horn manifolds and a front u shaped mount for the motor.no fab work needed at all to get the smallblock in not sure on your tranny.mine still has the 3 speed trans but i am in the process of installing a 396 and a t10 4speed.still researching my swap details....kt.