The 2801 won't likely break the studs, but the 068 will be easier on them. Plus I think the 068 is a better cam even with less lift. Even though folks call the 2801 an '068 clone with more lift' it isn't even though they are quite similar. Get a Melling 068, Auto Zone special order P/N SPC-7. Yes, a nice little lope with the 068 in a 350.
Porting the exhaust side isn't needed to run headers, do it if you want. The small ports of the Performer are very efficient and perfect for a 350, leave it be. Gasket matching it is fine but I wouldn't bother myself.
Benefits of a Q-jet? Better carb all-around, better gas mileage and ability to use on any size Pontiac engine (all are either 750 or 800 CFM). I'd sell the Holley for a Q-jet in a heartbeat.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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