If you want to retain the carb, I'd look at
http://www.holley.com/HiOctn/ProdLin...-174_FSBP.html This blower is good for 20+lb boost, but with the compression ratio that I'd expect your currently running, I'd suggest no more than 6 or 7 lb boost.
Hood clearance may be an issue, and you'll have to search around to find who is still making the adaptor plates to mount a 302 manifold on a 351. I think a few companies still make them.
A respectful word of warning : don't ever become complacent about the performance potential of your car..... these things CAN BITE
