This is a pretty interesting thread. I have a set-up that is pretty close to what Unit is mentioning here.
I went to the dyno last week and was pretty pleased with the results. I'm making 227 rear-wheel HP on a Mustang dyno. This equals about 260 rwhp on a Dynojet. I don't want to get into the differences of the two dynos, but I can tell you that the guy who runs the dyno adjusts by 31%. This puts me right at 300 flywheel HP. I have a big fat power-band that goes from 4400-5800 RPM. I'm making over 290 flywheel HP throughout that power-band.
I have had some minor port-work done to the heads and am still running my 19lb injectors. Don't get injectors that are too big. Get an adjustbable fuel pressure regulator and turn up the pressure if you're too lean.
I'm sure I would be making more peak power with some more expensive heads, but overall I am pleased with the GT-40ps. I was concerned they wouldn't make decent power. Hope this helps.
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Eric - 89 Mustang LX coupe
302 - Cobra Intake - GT40p heads - TFS stage 1 cam - FRPP 1.6 roller rockers - Naturally Aspirated
3:73 gears - KYB shocks and struts - Eibach springs - HPM Mega-bite Jr lower control arms - HPM upper control arms
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