i see it was dynoed with mufflers..AWESOME !!...it will make 15HP or a little more with straight headers....the HVH supersucker spacer plate has proven to increase 10hp on the dyno..my buddy runs on his dragters and is a DIE HARD bracket racer and swears it picks him up 2 hundreths..
I put one on my camaro and it will stand up and BOOGIE !!
ohh yeah how about putting the cut outs on the headers where you can open and close them with a cable from inside the cockpit...(neat)..15-20hp on tap when you need it...LOL
so its safe to say you can reach and get another 25-30hp or more by doing these 2 things...if it were my car i would also place me a good ram air induction thru the carb breather..use those round track duct work and draw cold clean air and funnel it into the ram air box...another 5 to 7 hp or more...if you do this with the hvh super sucker check your plug reading..most likley you will be just fine but worse case you would need to bump up a jet size ( but i doubt it)...
so i would say 500-510 hp is not out of the question..with very little cost and ALL bolt on stuff..
what kind of ignition box you running with that MSD pro-billet dist ?
thats what i like about the type car and motor you have..you can do so much neat stuff to them..to me its Very fun to ad little stuff and gain 2hp here and there...MAKE IT A JAMES BOND CAR...MYSTERIOUS BUTTONS AND SWITCHES EVERYWHERE !!!...i am getting excited for you...
and a damn good thumper (stereo) when you PARK the car..the motor is music enough when driving...AGREE ??
Brian