I have a 59 Apache with a 327 and Muncie 4 speed. When I bought mine it had a 283 with front mount, a homemade copy of the orignal type. I didn't care for the mount and decided to change it to side mounts, I couldn't find a side mount I liked either. Finally I made my own mounts, these bolt to the frame just below the top of the frame rail and forward about 2" from the normal location due to clearence for an HEI distributor.
The basic mounts are towers that use the side engine mount positions and no crossmember. They work well and even allow for the axle clearence as mine is mounted above the springs. If you take some time you should be able to come up with something similar that works. I would send pic's along with this but I'm deployed in Iraq at the moment(sorry). I hope this helps just the same.
