I see no problem with bringing up these cars here. After all, they are a part of Stock Eliminator history! In fact, I can't think of a single car that was purposely built for Stock class. Anybody?
I always thought those were neat (although ugly) packages. I see you have the cam duration listed at 284 but what about the lift? Per the NHRA tech sheet (this engine is still listed, see
www.nhra.com) it was .504"I / .514" E. Combined with the factory installed headers and 4.89:1 rear gears, they surely were screamers right off the delivery truck!
FYI, NHRA no longer has any requirements on camshaft engineering other than lift measured at the valve. NHRA shows the carb as a Holley 3778 list number. The specs aren't listed on NHRA.com which MAY open the door for "future development" of the package. The following cylinder head castings are now listed by NHRA as acceptable: 2465315,2658920,2843675,3671585,3769973,4323302. I would bet one of these castings flows better than the factory installed head. MOPAR racers could help with that answer.
I know of one but am not sure it was a factory package or converted "clone" back in the day. Owned by Mike Donolly it was raced as "The Pirate". Mike once owned / operated Phoenix Raceway Park during the late 70's thru mid-late 80's I believe. He now is retired in Ca. and I believe he still owns the car. I'll see if I can track him down and will get whatever info he has for you.
OK, after typing all this I went to NHRA's class guide. I found out this is now a Super Stock package only. Still rated at 275 HP. Probably, no definately in dire need of a HP reduction. Falls into 10.71 weight break for SS/I as a 2dr hardtop or 11.11 weight break for SS/J as a convertible (yes, NHRA says it's allowable). Well we know that SS/I is well into the 9 second times and SS/J is just touching the 9's so yes, it would definetly need some major HP reductions by NHRA. How much, I have no idea. The 235 HP engine has only been reduced -5 in SS for 230 NHRA HP and is down to 220 NHRA HP in Stock. My off-the-cuff guess would be for SS racing the engine needs to be 235 HP as the only thing the 275/273 has on a 235/273 is a larger (?) Holley carb in lieu of the Carter carb. As you may or may not know, factory headers and factory big cams mean nothing in SS class as these area's are wide open for improvements anyways. I know the 390 Ford can have a small Holley or a larger Holley (+135 CFM) with no NHRA HP penalty so maybe the D-Dart with Holley should be no different and should be rated as the 235/273 ~ NHRA rated @ 230 HP?
Paul Wong...could be a good combo for you???