mblair

As the car sits it's a SBE LS1 with a BTR LS1 NA Stg 2 cam (227/238 .620"/.605" 113.5+2.5),LS6 Intake, SLP lid, stock injectors/Walbro 525 pump with external regulator and -6an return, TSP 1 3/4" headers and catted Y, and 3" exhaust.
Car made 361/366 wheel on a mustang dyno.

Once I get a break from work(hopefully this summer sometime) I'll be adding the following:

TSP PRC 220cc CNC ported heads with .660 springs
Fast 92/NW92 throttle body
Deatschwerks 1000cc injectors (overkill but bought for future forced induction)

what do you think I'll pick up?

Forcefed86

iTrader: (4)

If you have forced induction plans for an gen3 SBE ls1, no real reason for heads IMO. You can easily make more power than that motor will handle on the factory heads. Its a lot of $ to spend for 30-40hp. Just turn the boost up a couple pounds on the factory head IMO.

mblair

It'll get a forged 5.3 short block when it goes boost.

Forcefed86

iTrader: (4)

Gotcha. Depending on the chamber size usually like 30-40 WHP.

99 Black Bird T/A

iTrader: (4)

I'd guess ~35 whp (+ or - 5whp) on a Mustang for the intake & heads.

MplSS

I have those exact heads, with a cam motion titan 4 cam, and an ls6 intake. Just the cam and heads gained 81 h.p., so I'm going to guess you will gain somewhere around 40 h.p. I think you will be very happy with the result!!