You sound exactly like me! I have a 610 (1982) that won't get to 36mm let alone 38mm tires, but I think it'd be great to, and I ran those exact same tires (briefly) in the same size. The brakes have plenty of vertical clearance for 38s due to the caliper mounting height, and the fork is fine as well. If I did dimpling, I'd probably have other things done to it. Lots of touch-up paint applied, plus a small dent in the TT, and damaged decals (photographs well, though). It's actually a pretty light frameset for a longer sport tourer and it did well when I built it up with modern components. The Strada Biancas felt amazing at 60/70 psi, but rolled too slowly. +5 psi for both and that was too much. Weird. Oh well, time for bigger tires via dimpling???

A bit of a silly build, but good nonetheless. Half built with 27" wheels sorta like it would have been, but honestly it feels criminal given how heavy those wheels are and how light the frame is. I'll probably port it over to another (lower level Trek) frame to sell and leave the 610 for more musings.