They actually make side mounts that will go on a V8 ,I don't know who makes them tho, I made my own for my 53. For the front I used a tranny cross member from a 73-77 chevelle and front V8 mounts from a 57 Chevy car. The cross has the perfect dip and angle for the 57 mounting system.All you have to do is measure the width between the frame at the front and cut it to width and weld flanges to the ends and bolt it thru the side of the frame.Don't forget you'll have to move your steering box over 1 3/4 " .For exhaust I used 2 driverside exhaust manifolds from 77 Nova's.One dumps behind the box, and the other dumps in the front.
