Hello! I have a 1992 Black Max 150 2.0L and as I知 replacing the power head I知 finding clues which tell me it has been swapped before with a very early 2.0L style block. The current block and adapter plate have the large, almost triangle style exhaust ports and the block I知 installing has the regular square exhaust ports. Can I use my adapter plate with the large ports with my block which has the smaller ports? It looks like the gaskets will seal but I知 wondering if I値l lose performance due to lack of back pressure or inefficient flow. Thanks in advance for any advice you can give!