What would YOU do?

Well, thanks for your input and viewpoint from your side of the fence! Gives me more food for thought. I'm not 'there yet' with the final blueprint of this motor, obviously...which is why I'm asking questions and doing a lot of pondering on the john. (yeah, I think of motors there, too)
The thing about old school is 1) I understand it, 2) I have mostly what I need to build what I had, 3) I was happy with what I had, and what it did, and 4) it seems like the easiest approach for a guy of my age.
But if I'm gonna have problems making it work because of changed fuels, I realize I might have to re-think my strategy.
Again, appreciate your (and every one else's) input on the matter. I gotta go think....