quote:I want to add horsepower, clean up the engine bay, but, do not want to modify the look of the engine and the engine bay beyond the original
Mangusta Steve's book will not work for that 03390 number.
The 03390 tag is just the engine BLOCK number as assigned by Ford/De Tomaso, NOT a Ford engine ID tag. It will tell you nothing about the engine internals. You most likely have open-chamber heads on a two-bolt or four-bolt main block. As noted above, the 2 versus 4 issue is not really important, and it is TOTALLY not important if you really do not intend to change the look of the engine.
With your limitations, there is not much you can do to add horsepower other than change a cam and maybe upgrade to a stroker engine.
That is, do you REALLY mean NO modifications to the look of the stock Ford engine - assuming that is in fact what you have now - which is doubtful.
How about a photo of your engine?
Most HP improvements will require you to change the air filter housing, change the intake manifold, change the carb, change the headers -- all of which changes the LOOK of the engine.
You seem to be at the very beginning of your learning curve of Panteras and Clevelands. We are here to help, but you should probably do a bunch of web surfing and do some archive searching here at this forum to get some ideas of what it is you really want to do.
Larry