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I always try and use the headers that are going in the chassis and weld in the EGT bungs and O2 bung. After tuning for best timing, A/F ratio, spacers and whatnot I'll put the airflow meter on to see what the engine is actually using. Also try the aircleaner assembly they want to use, fan and alt. I've opened a few eyes by showing how bad or good some of their stuff is.
My 605 LOST 117hp bolting up my 3-1/2" dual exhaust with X-pipe and 3-1/2 Ultra-Flows over open headers and collectors. A friends resto 440 mag lost 22hp using a factory dual snorkel aircleaner assembly over an open style element.Dave

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There is nothing out there for exhaust on a engine
of that size unless you start looking at diesel exhaust
(a pair of them).. even with dyno testing I have
always had to tweak it in on the track for each day
if the weather is way different... the dyno tweaks
it in for that day

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Fair enough Mike, my dyno does have a weather station that corrects the numbers to the standard, that's about all a person can do. What most people fail to recognize is it's a tuning tool. For instance, first pull makes 400hp, after tweaking the timing, carb, intake, fuel, whatever... you might finish at 450-500hp. Doing the same testing at the strip might take a whole season or a full day or two of private testing. I made 18 dyno pulls just dialing in the thermoquads on my tunnelram. Most people can't do it but in my case I made the sacrifices and spent the money so I could.Dave