GT-40 heads with port work etc... are good for 10's easily. I know several people running 11's N/A with untouched GT-40 heads.
I wouldnt put GT-40's on a 393 though. They would definitely be a bottle neck. If I was building a big cube stroker like that I would go all out and get AFR 185's at least.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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