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2-1/2" exhaust will lower the HP. Go with 1-3/4 for max HP or 1.5 for max smoothness.

To swap from A12 to A14 requires several mods:
* (optional) fit the stronger A14 gearbox
* modify the engine mounts
* swap the exhaust down pipe
See A-series Engine Swaps

okay thanks, these are the engine mounts

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2.5 inch would be huge and I do not think there would be any power gains.

Just need to show us which engine mount brackets you have installed. The A14 takes a different bracket on some A12s otherwise should swap right in. Also look at getting a 32/36 Weber downdraft carburetor. Its an affordable upgrade from the standard carb and gives more power but less fuel economy. All you need is an adapter plate and it mounts to the standard intake manifold. Can be bought online.

Do I need to put/ modify anything to get the a14 in?

Thanks mate I'll look into, would a new exsaust say 2 1/2 inch help on the A14?

Unless it is a proven recently reconditioned engine.

Proven means receipts and documentation from a reputed workshop. Not just repco receipts for pistons, gaskets, etc.

Absolutely. Running, good condition A14 engines will cost anywhere between 350 and 500. Anything higher than that is in my opinion, expensive.

Looking to spend under $800 as I'm still at school with only a casual job. Will I find a good A14 with for that money?