The 5.0 is done and in, and it runs faster than the 289 before no doubt, but something's not right still. I think it's the intake, it's got a aluminum(ford) 4v manifold and a carter 600, I think it's not tuned right at all. Im also running stock manifolds to 2" pipe back to flowmasters so there might be another problem. I am saving up money and here are the questions/upgrades I need advise on. Manifold, I'm pretty sure from what I've read the Air Gap RPM is quite an awesome "street" manifold with power everywhere, might compliment my F303 cam well. Carb, I was first thinking about the grant 650 street demon but then I saw the holley 670 street avenger and it is also cheaper and has supposedly better performance. Then onto headers, I'm redoing the whole chassis/exhaust next so I am going to 2.5" piping and some nice headers, here's the kicker though. I've heard "full length" headers have ground clearance problems and you have to go over speed bumps and whatnot carefully. Would Tri-Y's better for my "street"/strip/mean daily driver application? If so what size collector 2.5 or 3" and I'm hopefully roadracer can make me one of those famous xpipes. Last but not least, heads, this isn't for a while but I'm not going to skimp here cause as many ppl will tell you and from what I've experienced heads can really make or break a car. I think my cleaned up stock sized valve iron heads are really holdin my engine back now actually. So I'm looking at you know Trick Flows, Edelbrocks, GT40's and then I hear everyone ranting about AFR's. Like I said I'll save up if I have to but they sound like they're really worth the $$$. Can anyone tell me 165 or 185 for a street machine that will hopefully run high 12s or 13s and make power 1500 - 6500 ?? Obviously I'm not goign to get the smog ones so take that into consideration. I just down want to "bog" the engine with too much stuff and be mismatched but I also dont want to pay $1400 for their "lowest" heads, but whichever ones will work best right!? Also I'm having to really retard my timing to get it to run w/o overheating/pinging and I think I went too high compression 10:1 and I'm running 89 now, I think I'll stay 91 from now on and maybe get some additives in there. Hopefully once it's timed right it will run better but if anyone could advise me on those subjects, intake, exhaust, and heads I would greatly appreciate it. Like I said its a solid built roller 302 with hyd. roller f303 cam and a strong bottom end, 28 oz balance. I'm shooting for about 300-350 RWHP and anything above is welcome. Thanks!