sure, it's never to late, plus you could always sell the blower later if you wanted to. used blowers for mustangs are like free candy.
I hear you on liking your car, and going for it. I did the same with mine. Looked seriously into getting a Cobra,
but I really liked my car, and it's in perfect condition. So I decided to keep it and bring on the mods.
Slap a blower on yours. Go for the power mod, I put mine off for years.
If your motor gives out, you could rebuild it stronger, and boost it up.
or you could swap a v8 into it later on.
it's like Voltron.
Let us know how the interior goes for ya.