Go with the OS 1.60 and use the Cline or Perry VP30 pumps if you desire and replace the rear bearing with a stainless steel one.

I have been running the Webra in my pattern planes for a few years now. It takes patience and a good programmable radio to deal with the mixture carb and you need to replace the rear bearing with a Stainless Steel bearing from Boca.
The Webra is a rear exhaust motor.

I am now converting over to the OS 1.40RX for simplicity. You could use the OS 140RX if you can use a rear exhaust setup. The OS requires replacing the rear bearing to a stainless steel version. OS has a stainless steel bearing for the OS 1.40 EFI that you can use or get one from Boca.

Just about everyone I know in the pattern comunity replace their rear bearings with a stainless steel equivalent and typically get hundreds of flights out of them.