Set up for a smallblock race engine on pump gas 600hk

The other night i was up racing at a track i hadnt been to in 10 years. Used to race 10.0 index up there( Mid Michigan Motorplex). Made a lot of friends racing there, and met several of them i hadnt seen in years.
One of them is a guy named Jack Barna’s dad. He heard my name over the loudspeaker and came over to my pit spot.
Turns out his son Jack owns a very sucessful machine shop/ Mopar slanted engine building business, and was the one who actually built the shortblock in my current car( 360). Its called Valley machine.
Anyhow, guess they just finished building a motor for a dyno competition( think its enginemasters but wont swear to it)
Stock stroke 360 that is pump gas friendly. Has the Eddie Victor heads on it that dad said they got to go 380+. Anyhow, thus far they have made 761 horse with it on pump swill.
Meaning to call him here soon. Gonna have him look over this 418 i have before i use it next season, while talking about that will get particulars on the Victor motor. His dad said after the dyno sessions he plans to sell it. Not a spring eater cam either, i was told. He used a production Magnum block for this build, BTW
So yes, over 600 is more than possible. Heads are obviously key
Geez Louise, I was just trying to be cute. I know it can be done on 91 octane pump gas. I built this one to go 629 HP with the iron LAX heads..................

Is 426ci 360 a small block?