k I think i'm in. New member here, have a 67 dart 440 car, altercation relocation kit in front with manual rack & pinion steering, 727 tranny with 3500 stall, mini tubs with cal split mono leaf in rear on a dana 60 with 410 gears. aquired a un molested 400 block want to build a 512, would like to make min of 650 hp.I'm told that if I use max port 270 heads that it might not fit under the hood due to poor intake selection. The car has a fiberglass hood with a 4" hemi scope. I'm not sure if using the 240heads I can get into that hp ,the car is 98% street driven, but it makes it to the trac a couple times a year. It has ran 11.40 at mission track in BC. Pump gas motor also. Any body out there have some insight for me PLEASE!!!!

Welcome aboard. I cant help but there is an abundance of really capable guys on here, you should post on the Unlawfuls race and and engine builders and PICS are wanted by most!!!

Done Thanku

It would be better to state what et you expect , the track you run the most & how much the car weighs, & welcome here !!!

Try posting this in the race section, some of the guys there should know for sure.
I had a 512" RB with Indy EZ1 heads & single-plane intake in a '72 Duster.
With a standard 6-pack-scooped or a 3" cowl-induction 'glass hood (had both), the 14" air cleaner (drop base) just cleared, maybe 1/2" or so.
That intake is pretty tall.
Low-deck should sit lower at the hood height.
Ran easy 11.30s with a 3.55 gear & 275s, SS springs, fully streetable, moderate cam & 850, all steel except hood.