A couple of other advantages that modern engines have are improved fuel economy and the ability to run superbly on low nitro fuel. I get over 20K with an APC 6x2 prop on 10% nitro fuel and do the pattern on 7/8 ounce of fuel with the AP Wasp .061. The old Tee Dee would need 1-1/4 ounces of 25%.
Another plus is that the modern engines are happy with a 50-50 mix of synthetic and castor, so they never varnish up. The pistons have pins, not ball sockets, so they don't fail. Finally, the AP Wasp has a bronze bushed crankcase that is vastly superior to, at best, anodized Aluminum of other engines.
No, I don't have a "piece of the action" with this engine, I just am passing on my enthusiasm and feeling that I have found the (currently) optimum small engine. OK, it is an .061, not .049. If you want a good .049, you need to find a Brodak Mk 1 and add the Nelson head.