Since it is undercarbed and not much plenum work was done to the intake plus being a solid flat tappet instead of a solid roller, I think anywhere between 600-650(what seperation angle and intake centerline?) at around 6500RPM(guess because not knowing LSA). a 2 1/4" 4150 to Dominator spacer opened up at the 4150 flange blended into the intake port roofs and 1050 Dominator with a Solid roller of 270/275 at .050" on 108-110 LSA and .700" lift and that would be up near 650-680HP(heads then being the restriction needing AFR 225s).
It'll be a lot better than the 418 of the past though. Good luck Drag79stang.
Also the added plenum volume from the Dominator spacer/adapter and anular discharge boosters on the 1050 will would really help the combo out and broaden the power curve. Large CID needs more plenum volum and high compression needs more volume and both combined mandates more volume.
I think the carb is a little small for making power much higher than 6000 rpm. Those 750 sized throttle bores are only going to flow so much air. The dominator will definitely help the output at the higher parts of that cam's rpm range.
The 12.5 cr seems a little low for a 270 @ 0.050" cam, but should still produce adequate cylinder pressure. Hopefully it has a fairly tight lobe seperation.
I would guess somewhere around 640 hp @ 6300 rpm once it's all tuned in.
If he has enough time to really tune it in and try different spacers with larger carb sizes, I don't see why it shouldn't make 650 but it should make nearly 500ft/lbs torque depending on what LSA he has on that cam. 625-630 would be a safe bet on HP I guess. Very tough to guess without a complete rundown of what he has and all the specs. One thing's for sure, that old man... I mean Drag79stang will definitely like the way it runs compared to his old combo. Really should have a solid roller to get the most from that combo. Maybe he'll get one later in the year.
Hello Guys...........I hope he does well and makes some satisfying power.........I wish I would of known that he was going because I could have sent him one of my new 950's that flows just a tad more.....The 950 consist of a 1 3/8 venturi(750 size) and a 1 3/4 butterfly size(850).......and that combo struggles to flow over 900CFM........Now we are opening up the venturi .050 larger and milling the throttle shafts in half and are getting them to get in the 950-960 range......Either way the HP series carb is a great piece............Cant wait to here how he did..........Jesse @ BIGS