I have 2 sets of 305 HO heads, I ran the numbers on them and came up with 1.84-1.50 valve and 58cc chambers. Sounds like a good head for compression to me. But are they any good to use in a mild street build 350 ? Im not to sure how or where to use a set of them but id like to since ive got em

 

those 305 heads are 58cc and will push a 350's compression through the roof. Not to mention you can get cylinder shrouding because the bore of the 350 is larger than the 305. for a 350 you are going to want a set of head sin the 62-67cc range. I would suggest looking into a set of Vortec heads. They are probably the best 350 heads you can get for the money...though that really depends on your budget.

 

compression i dont mind but i forgot about the shrouding, vortecs are getting affordable i guess ill look for some