New Guy.. Wanting expert opinions on N/A modifications on my 5m

[84CanadianSupra]

Hey everybody, Im a new owner of an 84 supra

5mge, 5 speed

315,000km

Now, this old girl is losing power, but still runs strong, head gasket is going.

Im about to renew the front end

Now, down to the point, What do i do to get some decent reliable N/A power out of this

Of course ive got intake and exhaust, but where do i source the parts?

I want to port and polish the head and send the cam in for a regrind, will this yield any results?

What should i do Toyota entutiasts... enlighten this poor noob.

Cost is no concern..