Edelbrock / RHS heads, or go BIG block and put it to bed!

750 DP would be the best all around carb and you might find a good buy off ebay.

You could just swap carbs first. Look in to tossing some stuff away to lose weight. If the car came with AC and it no longer has it, by the heater core is some unneeded parts, only like 15 lbs but it all adds up.......................we used to remove the seat belts, carpet, padding to loose weight back when I went to high school, ah the good old days, lol