Input needed on possbile engine combo

Those parts would make an improvement but will fall way short of your goals.

The cheapest horsepower and way to your goal can be found with a supercharger. Nitrous? bottle refills gets expensive though and run out at the wrong time.

Some used GT40P $350
New head bolts $50
New valve springs $80
Roller rockers $150
Cam $200
New chain and sproket $50
Used intake $175
Head gaskets $50
Intake gaskets $22
Anti-freeze $24
$1,151 for maybe 30 HP

I'm sure that you can find a used supercharger kit maybe on eBay for not much more money and maybe 110 Hp more.