So, a bit to update.
True to my word I replaced the hipo manifolds. While I was at it I replaced the heads. And while I was at that I replaced the intake.
What I used are Trickflow 170 heads, Comp Ultra rockers, Trickflow Box R intake, Hooker comp headers, and got a bigger Aeromotive fuel pump also.
Last weekend I stripped it down and put it all back together.
Today the car went to liverpool exhaust where they matched the headers up to the magnaflow exhaust.
Once the rain stops I'll take it for a spin and see the gains. Dyno will come soon....500rwhp here we come!