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If you go with LE reciepe, he will get you 400. My LT1 for example h/c and headers netted 90rwhp and 50 rwtq for a tottal of 365 rwhp and 350 rwtq and my cam is only 215/224 on 110lsa. The LT4 has at least 30 more ponies then its older brother the LT1. Bigger heads, better intake. The right tunner can make a difference of up to 30 hp. Check out www.advancedinduction.com they have tons of dyno and track results from using there heads and cam combos for NA LT1 and LT4s.
Thanks for the info I went to there web site they seem to be selling some serious HP. Like I mentioned earlier I'm not a racer I like to tear around with some of the vett guys and find some twistys just trying to stay in the pack. I'm going to give them a call. Thanks
Your heads are great, just have them ported, but don't waste your time/$ if you are not going to get a bigger cam to utilize the heads. Then of course, it will get rougher, but not bad if you don't go to big on the cam.