Everything Dave said plus....use a dual pattern cam. The exhaust ports on a Lima motor are notoriously lousy and need all the help they can get. I'd use premium quality equal-length headers and minimum 2 1/2" tubing to the rear with a "H" or"X" connection right after the collectors and before the mufflers.

You can build a 9.5 to 10.0 motor that will run on junk pump gas by minimizing the piston to head clearance to 0.035" to 0.040" and tailoring the camshaft to the exact static compression ratio.

There are a lot of smart people on this board, so once you know what you have for a motor, post here so we can help you zero in on the components needed to do it right the first time.