I have had 4 motors with DME cams. Good power, very streetable cams. Easy on the valvetrain, it doesn't tear up the top end. Not fast ramps. Dave is very knowledgeable. The worst cam I ever had for valvetrain life was a. Lienweber L6 cam.
We ran that cam in a 108" Shovel in the ECRA, and AHDRA.(Dave Makie was sponsored by Rivera, and he ran "Uncle JIms" cams at one time as well.)
Made BIG power, as did the L7.
The spring technology was just not there, then.
We ended up using K-Motion automotive springs.
We settled on an Andrews S86, and shortly after converted the engine to an Evo, with STD heads, then we devised a dual-carb common-plenum system using 2 S&S B series carbs.
PW Morris ran the "Double D" set-up to steal the show at a couple dyno shoot-outs with his well prepped 131", and was featured on Cobin's "Ride" TV program at one time.
Scott