Thanks for the replies guys....

Yea thats it, the mach backplate hits the chassis before the engine mounts. The stock engine is good but there be a time when i will feel the need for more. The Mach can stay as my sparte for the LST but i dont want to buy a another engine for the LSP that doesnt fit. So was asking that due to it being a buggy chassis would I be safe buying any engine that i know fits into a buggy? and also as sjm said a wasp .28 or something thats known to fit into the LSP....