If I went with any of the combo kits available including the Holley SysteMAX I would have to sway towards this one.
http://store.summitracing.com/partde...1&autoview=sku
Here are the Edelbrock aluminum heads from Summit for just a little over 1k a pair. If you have any connections from a dealer you can get them a good bit cheaper.
http://store.summitracing.com/partde...5&autoview=sku
302 and 351 heads will interchange depending on deck height, Etc. stock for stock you should have no problem swapping them.
When I build a small HP street engine I usually always go with the pedestal mount heads to keep it simple so you can just slap on the rockers and torque them to 22 ft lbs or so and let it ride. Just FYI.
Brock if you go to SCF and post a WTB in the for sale/wtb section you will get several cam replies and should be able to get what ever you want in good condition for $100 and sometimes I pick them up for less. If you find one and need my opinion of the seller just shoot me a PM. I have dealt with almost everyone on there and had some really good deals.