If you search on my posts, you'll see how that coating holds up long-term under abuse. Nothing else will hold up that you can apply yourself.
If you can't do it right in the time or budget (or tools) you have, don't even waste money on paint. It won't hold up to the exhaust temps from a supercharged engine.
You WILL need exhaust manifold gaskets even if there are none installed on the car now. Make sure you get no coating or rust between the flanges and cylinder heads.
I can also tell you that you will love and hate your car at times while you head out on this Series 1 Perforamance road. And you may hate it more than you love it.
Good luck. Been there, done that.
The number one rule for performance in Series 1 power that I can give you is this:
EXHAUST ALL METHODS OF MECHANICAL TUNING POSSIBLE BEFORE RESORTING TO PCM TUNING......OLD school.
If you do anything other than that, you will chase your tail.