fwiw a 1915 with 8.5-1 static compression ratio, Engle W125 with 1.1 ratio rockers (.460 lift), balanced internals and lightened flywheel, and a 1 5/8 4-2-1 Sebring exhaust is, to me, a pretty nice engine.
Claimed HP is 120 at 5500, torque about 125 at 4000. It's quite peppy over 3000 and seems to like the air over 6000 rpm; I set the rev limiter to 6400.
It could be torquier in the 1200-2500 rpm neighborhood, and I suspect smaller primary tubes and a true merged header would remedy that some, and the better intake velocity of a set of Panchitos heads would do so even more. But overall it feels more than adequate in my 1550-lb Spyder. And that's with a 3.44 R&P.
The same jugs with Michael's Engle 110 and 1.25 ratio rockers would get him about .490 lift with a little less duration, so probably similar numbers to my engine, with maybe a wider torque band and a little more torque under the curve owing to the Panchitos and EFI. A really sweet combo.
Should Michael build a 2110 or more? If he wants more, I guess he should! More is more, after all. But I think Danny's initial advice is probably the second best idea—after leaving well enough alone.