I have a set of 351w heads(D8OE) and i currently have on my car are the E7TE heads. Are the 351W heads a better head when ported over the stock heads ported? I am on a budget so aftermarket heads are out of the question. I'll be using a 306 short block(stock style pistons,forged) with a b-cam, ported cobra intake w/1" spacer, full exhaust, cai,75mm maf,65mm tb. , 155 lph pump and a 5 speed. Thanks!