on my swap , it has a turbo 350 behind the 350 small block an the motor mounts were moved forward to Fix the Distributor /valve cover clearance / distance from Radiator Issues .
Yes it did in the same breath make the purchase of a custom length drive shaft a must ...but the cost of the drive shaft outweighed the problems in my opinion.
I have plenty of room behind the motor for a HEI & any valve cover and my fan sets right at 3/4" from the radiator.
Tim
