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Re: Lets talk Small Block
I have an 84 Monte SS with a 406 small block that barely makes 10 inches of vacuum at idle and have no problem with the power brakes. You may want to check the check valve on the brake booster as well make sure that isn't leaking. I would also make sure that the vacuum line goes right from the manifold directly to the booster with not Tee's or any other connections.
Now as far as what to do with your motor. If you have a good 350 with decent heads, I would say get a milder cam and torque converter to match it. Most likely that would solve your issue and not cost a ton of money. If you don't like the results you could always get a different short block swap the heads and most likely you would have needed the converter anyways to match the new motor. If you still don't like it you could then spring for a nice set of heads. Although if your looking for low end grunt I doubt you would need some crazy high flowing heads.
That's my suggestion.
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