Excellent work, especially for your first build. I second the notion that this forum has a great wealth of knowledge for both the first timers and old timers.
Welcome back to the hobby. You'll like the MAD distributors. If you don't have one, get a pin vise to drill the really small holes in the engine for the plug wires. I think SG would work just fine as a filler. You could also use putty (Testors works for me for small holes), fill the hole, sand and re-drill it. Good luck.
This is my modeling community (for the short time I've been a part of it) and for me, being part of that community is posting my work. I generally comment to give an atta boy when I see something particularly cool or different.
I'd probably spray the satin black over the clear. Thinking outside the box (for me), what if you painted the whole thing gloss, masked off the stripes, cleared, reverse the masking and spray with a satin clear. My 2 cents, ymmv.