i have a 454 that came out of a rusted suburban. this is my first big block build. i plan on stuffing it in my 74 cheyenne pick up. im going to use the summit heads for the big block chevys. i plan on using the 200 shot of spray. the cam i want to use the nx274h or the n+ls6 nostalgia cam. both are by the comp and the 274 has a 113 and the ls6 has 112 lsa. question is if i use the nx274h will i make good power off the juice especially at the lower end? i'm looking at 9.3 to 9.5 to 1 with dish pistons. i need to know is running a nitrous cam in a daily driven application a strong choice. also has anybody ran both cams and were satisfied with performance? any advice is GREATLY appreciated  

A narrow lobe separation angle would benefit midrange torque production, but this would be at full throttle of course...

The difference in power between a 108° LSA and 112° may be less noticeable with the induction being restricted by a closed throttle.

Basically all OE vehicles have used very wide lobe separation angles on their cams for decades, so this is probably a fine idea for a ride that is frequently street driven.

Something is wrong with your compression ratio calculation I imagine. That sounds very high for a 454 with dished pistons.  

the heads from summit have a 308 intake runner with 119cc chambers. so whats the CR then? will big block perform well with a 750 cfm carb or am i goin to go bigger?  

The intake runner does not affect static compression...

Head gasket volume, piston dome or dish volume, and piston to deck clearance affect compression most significantly.

A 750 carb should be alright for around a 400-425 horse engine.  

ok gor the carb part. but using the 119cc with dished pistons with stock deck height and gasket thickness of .043 or .062. dont know about dish volume. can u help me out on that?  

The dish volume shouldn't be a difficult spec to find. Any aftermarket piston manufacturer almost has to give it. What pistons are you planning on using?  

i plan on hrc dished pistons. forged of course  

A part number perhaps?