Quote Originally Posted by mooneye777
if i remember right you are from around san antonio texas if i remember that right, if so do not pay to have a used block shipped to you. about 3-400 bucks for shipping alone. there are probably 1000 350 blocks laying in garages and junk yards in your area. i would go for a bare 4 bolt main block and build it from there. a used long block to redo the heads, is almost the same cost to buy a set of new aluminum heads. have the block cleaned and tested for cracks and machined with new bores, then start buying parts from there after you know the block is in fact a good block.
This is good advice. Start with a standard bore block so you will at least have a chance to clean it up at 0.020"-over. The more cylinder wall you can keep, the better off you'll be.