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ditch the Edelbrock for a real carb and I'm sure you'll pick up and loose the flat spot.

I'd guess that you'll need more converter and gear if you want to run quicker than the old combo.

But your assuming a 4000lb car in the mix(as I thought). My feeling is who would do such a thing when a real car should weigh under 3000lbs if performance is a goal. It's the assuming that is the trouble,too many blanket statements that could lead the wrong direction.

Yes!! the factory intakes are designed for 4000lbs with small CID engines,no wonder that at RPM's they die. "No one runs the single plane manifolds because the springs/rockers, and cams." Yep just ask all those guys running the SINGLE PLANE DRAG PACK intakes to switch to a 6.1 intake for a big...

Without an adjustable valvetrain I don't see the point. As to running a dual valve spring could you not have a valve made with the lock groove located down enough to give rocker clearance? I'm sure it would open up other issues,but has anyone any experience with this conversion? I'm not keen on...

I'm not looking for more that 850hp or so. Stock 6.1 with forged pistons,rod upgrade. Already have a Turbonetics T76/.96 Q trim so I'll give it a try and upgrade if I need to. Fast EFI,2980lb with me Duster,Dana 3.54 gears,street car that may go to test &tune a few times a year.

Thanks guys. I'll order materials and get to work.

I'm building a 71 Duster 6.1 turbocharged. Has anyone found factory exhaust manifolds that might fit? Manual steering,no a/c,I can move the alternator. Thanks for any help.