I took my 73 Plymouth Duster to the dyno a while back and got VERY heart-breaking results :banghead: Ill post the engine build and then post the numbers I got.

Chrysler 360ci, bored .030, full machine job
factory cast iron crank, shaved .010
Speed Pro flat top pistons, 9.3:1 static C/R
Chrysler "J" heads, 2.02/1.60 (conversion), fully ported
Factory rockers
Comp Cam 268H (218dur@.050, .454lift)
Edelbrock Performer RPM Intake, Port matched
Hedman street headers, 1 5/8" primary tubes
Holley 670 SA
Taylor 7mm plug wires, Mallory MSD, Summit racing E-coil
X-pipe setup, flowmaster 40's

Now my peaks turned out to be 229hp@4700 and 289tq@3700.
How could it be that low?? Ive seen very similar engine builds making 350+ hp and tq. I know the cam and heads are mis-matched, but I don't think that could make that big of a difference. (I am changing the cam soon though)

The one thing that always bothered me that I was worried about was the current camshaft. Before the engine was started for the first time, my dad wanted to have the timing set pretty close. So he had me crank it with the spark plug wires off (not starting it intentionally). I told him it was a bad idea and that it could roast the new cam (hydraulic flat tappet), but he told me it would be fine, which I didn't believe. The engine probably cranked for 30 total seconds before ever firing up. And it had about 3000 miles at the time of the dyno, and compression tests all check out good.

The car feels fairly strong, but the 1/4 mile is still a little slower. I got a 14.2@98mph. Stock torque converter, 727 transmission, 3.23 posi.

Any opinions on this?? Any help is appreciated!

My opinion (after numerous wheel dyno runs on specific dyno that reflects 66% power at wheels) is that there's probably nothing at all wrong with your set up. Many chassis dynos will not reflect the engine hp , but rather a percentage. The one I am familiar with has a very repeatable history with NA small blocks registering around 150 - 160 hp.

How's the car run? it is probably just fine even though 14 seconds seems a bit slow.