Tires and wheels on a '74 MH90

[greywuuf]

Hi guys,
I am a little new to the "big stuff" and have a question concerning a ruck I am looking at. we are talking about a '74 Chevy mh90 that has budds on it. I am a little gun shy as I have two old trucks all ready with 20's ( tube type, two piece wheels ) and am sick of it. now all I have of is a picture of this "new truck" I am interested in and I fear I am getting into the same old thing. I was hoping that '74 would be new enough to avoid the hassle but I think there are enough to clues that It is not. First of it appears to have lock rings .. leading me to believe it is tubes.. leading me to believe it is 20". the question is are Budd wheels universal? will a set of tubeless 22.5's go right on there? or is this going to be another nightmare of Supply and searching?

Fearful in the North
Dan