I bought M/T ET Streets for my 67 recently. They are on a Weld Draglite 15X8 rim.
On the front, I have Weld's that are 15X6 with a M/S rated radial.

I'm looking for suggestions of what to run up front for tires. Should I run a front radial or bias ply?
Is there a tire that is suggested to run when you run ET Streets on the rear?

Running with less unsprung weight is good, especially up front. Most run a 15X4 wheel with either a Moroso DS2 or a VW tire, 165R15.

The Moroso tire is off-road only use as the radial can be used on the street. Radials in the rear, radials up front, if street driven.

Use caution if you run VW tires up front... they're rated to ?? 85?? mph.

I run bias ply's in the back and radials up front. It's not recomended but there's a lot of us that do it. MT does make a street bias tire that would be a better solution.

I think my wheel is a 15X6.

Can I put a more narrow tire on that?