Disappointed with my engine

Thanks for your input. A Slingshot is nothing like your heavy door cars to run. Time and tine again it's been shown headers make no difference to ET over Zoomies. For a car that's just for fun like mine, converter selection isn't as critical as it is with your heavy tin tops - we just don't have the mass to shift off the line and we don't have suspension and stuff to think about - we tune the lauch with tyre pressures wheelie bar adjustment and the addition of some weight on the nose depending on the track. In the early 1980's I ran one of the popular at that time tall econo drsgster type scoops which was sealed tight and picked up three tenths and 6 mph but the suggested pressurization of the vents/ fuel bowls is something I'll look further into. Wonder what the blow through turbo guys do ??? Moving to Chrysler has been a learning experience - I've learnt the hard way that the oiling system needs a bit of thought to keep bearings and crank in nice shape. Pity about the heads. I do get it - they're like a gaint kink in the garden hose.
Thanks for your thoughts
Cheers
Whenever you change valves or do any port work...you really should flow test the heads to see what you did, good or bad. If you did have numbers on these heads, and they were good, then you can easily move to something else in the tune or camshaft/induction area.
With a 1.94 intake valve in some j's or 974's blended/ported you can expect to see 260's cfm by .500- .550 with [email protected] and [email protected] etc... in other words.. they should perform well. If the heads are just simply cut for 1.94s...then they would be a hindrance. When you know what the heads do.. you'll know what the motor can do if right.