Which heads to use?

I am currently restoring a 1957 chevrolet 3200 pickup, causing the budget for engine work to be very tight, i.e. enough for vortec heads. I recently was gifted a 1975 chevrolet c20 it has a 165hp 350, upon measuring the bore the engine was never rebuilt and still has a 4.00 bore. Per my Motor's Manual from 1976 it shows this engine to have 8.5:1 compression ratio. The stock heads that came on the engine were 3998991 1.72 int/ 1.5 ex 76cc chambers. From two other 350's, I also have two other sets of heads casting #s 14022601 1.84 int/1.5 ex 53cc chambers and 462624 1.94 int/ 1.6 ex 76 cc chambers. From Mortech's website the heads I am leaning towards using 14022601 are supposedly for a 305. From what I have read the lower flow of these heads don't appear to pose an issue to me as this engine will rarely ever see revs higher than 4500 rpm as I am only planning to use the truck as a daily driver and occaisionally hauling atv's. I understand that with the stock pistons and the 14022601 heads will have a compression ratio of about 10:1. This seems a little high for pump gas, so I was thinking of using head gaskets that are .050" thick and a long duration cam like CompCams XE256H to help with cylinder pressure. I have already purchased an Edelbrock Performer RPM Airgap Intake and have and edelbrock 600CFM 4 barrel and a Holley 750CFM doublepumper. As I intend this for street use I am leaning towards using the Edelbrock as I fear the Double pumper will not be wallet friendly with 3.25/gal gas. Which way would you guys go on this  

Well the 600 and the 750 would be way too much for the 305 heads unless you get them ported. I would match the intake with the heads. Maybe find some assembled heads from edelbrock to go with the intake and carburetor so everything bolts in correctly and there are no problems with intake ports and aligning them up. If you get 350 heads you can still run the 600 cfm edelbrock carb and the 10:1 compression just start your timing mark a little more towards the 10 or 12 degree mark. I would definitely not keep running those two different heads because of compression numbers and intake runner size and chamber sizes and exhaust ports.