If you want some good weight savings ideas check out the weight loss thread in the race section
https://board.moparts.org/ubbthreads/ubbt...nd-it-cost.html

If you want a small compact heater/ defroster unit, look into Summits version. https://www.summitracing.com/nv/parts/sum-991102-1/overview/

jcc covered the rest pretty well. I agree with him on moving the battery rearward. You should get ahold of Hemi Denny over on FABO if you want some advice/ tips on dropping a Hemi in an A body. Sounds like a cool build, you should start a resto thread on it!