400 Gross power?

PRH said

I’d say in 100% stock form, with the correct ex manifolds, stock earlier TQ(non-lean burn), driving the water pump and alternator, air cleaner in place...... 280-300hp “STP” corrected hp should be in the ball park.

Finding another 100hp with typical hot rod upgrades would be no problem.

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I took my ‘78 - 400 and added;

Open air cleaner
Electric choke (small TQ)
Holley Street Dominator
Hedman headers into 2-1/2 exhaust
Aero Chamber mufflers
MP chrome box ignition w/upgraded MP distributor

Not very fast but a reasonable return for a mill that mic’d at 7.8-1. I would have like to installed closed chambered heads and a small cam. I had a handle on the MP 272/.455 stick.