Basically a L98 350 with heads that have better low-lift flow:
Here's what I've got:

350 universal crate engine short block
S/R Torquer heads with 67cc chambers (~9.1:1 static compression)
Lunati Cam with 202Int/208Ex duration at .050, .430/.435 lift
Roller tip 1.5:1 ratio rocker arms [plan to move to 1.6:1]
Weiand dual plane intake with Q-jet [plan to move to TPI]
Stock HEI ignition
Headers

TPI Setup as it exists today:
Stock TPI hardware (intake, runners, plenum, throttle body)
Gasket-matched runners and plenum
Holler Commander 950 computer and wiring kit HLY-950-101
Venom #24 injectors
Adjustable fuel pressure regulator

Goals:
Excellent drivability & mileage
Good low-end and midrange torque, some top-end to ~5,000RPM

The Question:
What mods (if any) should I make to the TPI setup before bolting it up? Extrude hone runners? Port manifold?

 

You already gasket matched the plenum to runners, now gasket match the base to runners and throttle body to plenum. Just behind the throttle body openings in the plenum you will see two walls on the floor..... grind those out and also smooth the two outer walls. At the exit of the base you will see the HUGE injector bungs, grind those down and smooth back into each runner, then match the exit to your intake gasket.

 

OK, sounds good. Do you know what results it can deliver?

Also, do you know of a good web site that shows some of these mods? A good one I've found is http://www.stealthram.com/flowcomparison.html. It mentions adding a "3/8 inch radiused inlet" to the intake for a 10% improvement in flow on the ACCEL intake. I'd bet the stock one is the same; the nubs hanging out under the injectors are huge! Would like to see what a professional mod looks like before I try it.

Thanks!

 

Just get the intake gasket your going to use and scribe the outlines of it on your ports, then blend that back 3/8 of an inch. As far as results, I would guess a solid 20 hp over a non ported/matched tpi setup.

 

Does anyone doing this have any dyno or ET results? Most of the articles on the subject are using very aggressive cams (230+ duration at .050)