OK, as I research, I realize I have more to learn.
Just doing a casual online search (amazing the difference between pre-internet and post-internet engine builds) I may need to deal with lifter lubrication issues either way, as they hydraulic lifters evidently have an
oil passage drilled in the block. Don't know/remember if mine has that.
Also, I hear a rumor that the expansion tank needs to be different on a Cobra and those are $$$. I'm sure there will be more surprises....