Offshoreonly.com - motor builders advice

All good options here. I noticed you are in RI. What machine shop is doing the work??
If I am reading your post correcly you have two 454,s that have only 30 hours on them.
that need to come apart.

The weight of that boat would easily justify 540,s.
$30,000 is a good chunk of change to get you where you want to be.
Blowers Roots or Whipple or even centrifugal will get you close to
600hp.

Blowers option you will need.

1) hatches scoops (Roots)
2) Iconnel valves( Heads)
3) Cometic or felpro head gaskets
4) Forged pistons 8.5 to 1
5) upgraded fuel system

540 option or even 572,s

1) sell the engines you have now
2) locate a couple of tall deck complete 540,s or build them.
3) upgrade fuel system

Two N/a 572 with single carb is the way I would go.
that way you have simplicity and reliability and the TRS will stay together.

If you go to rebuild the 454,s please be sure you take them to someone who
does marine work.
If you don't have anyone please call me I have a couple of excellent marine
builders local to us.
For $30,000 there are alot of engine builders who could help you right here
on OSO. They may even take the 454 in on trade.
A couple off the top of my head would be
Randy at Cobra engines
Laz Mesa at Mesa Balancing
Zul
TMP

Theres plenty more

Call me anytime I love to help people go fast.
Gerry
401-255-5242