1974 340?

MoparMike1974 said
I dont think anyone has messed with the stamping. That stamp looks 100% correct font. Post a better pic of the casting number. The 340 used 360 heads the last couple years so that is normal. Did it have a windage tray in it?
In a pinch you can use telescoping gauge and calipers to measure the bore. Gets you close enough to tell what you have.
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Appreciate that, I have a bunch of investigating to do this week from all the great suggestions I received here. I cleaned this and some other blocks up to finally clean the garage out and get rid of stuff since I'm, well, aging, lol. The year threw me off so wanted to see if I can figure out what it is before I try to sell it to someone.