273, could it be a commando and CAM question?

I have a couple of questions but first a little info. My 70 Duster was originally a /6 car but I have swapped out the slant for a 273. The motor runs great and seems really healthy so I have not really done anything to it besides plugs, oil changes, filters and tuning. Instead I have made upgrades to the cooling, drive line, exhaust and brakes. I now have an 8 ¾ axle with a 3.55 sure grip and a 727 with a shift kit and a 10” 3000 stall converter with a tranny cooler etc. I figured I’d get a 360 to build in the future so now it’s ready for that.

The thing is the 273 has grown on me because it’s a little beast with the new ratio and converter that takes it right into its power band. I’ve tried to find out from previous owners if it might have the Commando pistons, but I don’t know. Is there a way to tell without removing the heads?
Previous owner said he installed a 340 cam and that the brand might have been Sealed Power, I’ve done searches on Google but could not find it. Anyone knows the specs for that or if they even made one?

This is what I do know about the engine and combo

1965-273
727 / Shift Kit
10" 3000 stall converter
According to previous owner a 340 cam from Sealed Power
Edelbrock D4B intake
Edelbrock 600 Performer Carb
Pertronix ignition
Headers
2.5" Dual Exhaust / free flowing mufflers
8 3/4 - 3.55 – SureGrip

I have 245/60-14 tires and it smokes the tires from a rolling start :burnout:
So after this long rant, how can I tell if it’s the hi comp pistons without taking it apart and anyone knows about specs for a supposedly 340 Sealed power cam? It runs great like I said, but is there a better cam for this setup? What HP would you estimate it’s putting out (ehh, hard to answer I guess)?

I might ad I’m a beginner and this is my first project, had to learn everything from the start on everything I’ve done so far, had tons of help reading this forum!!!

Here it is idling
[ame="http://youtu.be/ymqHjeFaotc"]302 Found[/ame]