Sorry I wasn't trying to come off as a dick. I'll do a thread when I collect some more parts for it. It's about more than just the carb. He outlined his ideas for a build and I worry he doesn't have the best ideas. From the sounds of things he's running a 2bbl adapter on the stock intake which is not exactly a great idea. Again not trying to be dick just offering advise here. He should start with getting a real intake, and maybe setting his boost levels a little more conservative lol
No problem. I fully understand. We all want to see an engine project succeed.
The worst scenario is when someone proceeds without advice and has a failure. Then they ask for help to fix the problem after the damage has been done.
The original poster (OP) was undecided about using the Offenhauser intake so I wasn't worried about addressing that yet.
It been 8 months since the OPs last post so we don't know anything about decisions or progress.
What I needed the OP to understand is that it takes a lot of work to modify a N/A carb to run on the street and get proper air/fuel ratios with intake manifold pressures ranging from a cruising vacuum to 20 psi of boost.
In this case a power valve must be used to be able to get lean enough part throttle for above idle operation and be able to supply large amount a fuel when under full boost.
The Power Valve passages need to be drilled out and it is recommended to modify the circuit to use the power valve restrictors to be able to fine tune at WOT.
The fuel pressure also needs to be boost pressure + 7 for the carb. If the boost is at 20 psi then the fuel pressure needs to be 27 psi.
That means an electric fuel pump will be needed with a boost referenced fuel regulator with a return line to the tank.
In order to get the tuning correct an air/fuel ratio meter needs to be used.
Then the OP will need an ignition system that can retard the timing as boost increase, typically 1 degree for each lb of manifold pressure.
The Holley Super Sniper 2300 which appears to be expensive up front takes care of all the above including the ignition timing.
Seeing that an electric fuel pump needs to be used in a carb application as well as a Sniper, the Sniper is a good deal.
Yes A forged piston is highly recommended. The pre EFI stock cast piston skirts break off into the oil pan under N/A conditions.
Detonation at high boost levels will break the upper ring lands off and/or punch a hole through the top of a cast piston