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Silver Sport Transmissions adds a plate to your bell housing that has the bolt pattern for a Tremec.

Does it vibrate when reving in neutral? How do the plugs, wires, rotor and cap look? A compression test would cross off a few possible causes.

Pull a spark plugs and ground it while cranking. You should see a blue spark. If it's yellow, it's not hot enough (low voltage) to keep the engine running.

Did you have the throttle plate wide open during cranking? Were all of the plugs out? It might go up another 10 PSI, but that 225 should be fine.

Try putting some of those "magic magnets" on the fuel line. It is said that they line up the fuel molecules for a better burn, LOL.

With the manual you lose the boost every time you shift, assuming you are not WOT (wide open throttle) shifting. With the auto, the boost is there the whole time you are going through the gears. It is even easier to build boost for the launch.

My 360 crate motor with a 750 carb, 3.55 rear and 0.68 OD fifth gets 18 on the highway. The 225 should have a lot more potential. How much would EFI help? A hot spark with lots of advance is good (MSD). A front air dam would clean up the aerodynamics a little. K&N air filter is easy...