They were all in all a decent engine.
Some OEM parts do fit those, and yes a Harley mechanic can repair/work on those.
HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
315-495-6650 tel/fax www.hillsidecycle.com
Palmer's Performance Products
Complete H-D Machine Shop
Case Boring, Cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Super-Flow Flow Bench
Direct Link Dyno Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
"30 PLUS YEARS OF H-D ENGINE BUILDING."
If you use search here on HDF for 'merch engine' there are just 15 threads. Seems Merch went out of business before HDF was born. I seriously considered buying one of their 131" motors, when they were still around, but the cost was very high plus shipping etc to the UK knocked that plan on the head! They were said at the time to be bullet-proof!