There should be a plate riveted to the drive.
Walter V-Drives
I converted my MD11 to FWC years ago. Left the V drive as is. No issues after 26 years.
If you have a water
heater make sure there is a restrictor in the system on the hose off the thermostat housing. I've seen quite a few people tear out their hair trying to find out why they have an over heat issue only to find the restrictor was removed. If you have the original owner's manula there should be a flow diagram of the cooling system. Basically the flow reverses through the water
heater when the thermostat opens.
Mount your heat exchagner off the engine. The OE FWC option had an exhanger mounted on the manifold but they tend to crack. Sendur makes good exchangers.
Put in an air bleed on the top of the thermostat housing to bleed out any air bubbles in the system. Be prepared to add extra coolant after the T stat opens. Or vacuum fill the system. Mine has a hose that runs from the air tap into the exchanger fill. easy to bleed out the system with the engine running.
I modified my cranksahft pulley to take dual 1/2" belts and hung a FWC circulator
pump off a bracket. You could use a 12V water/heater circualtor pumps off GM, VW/AUDI, Benz or BMW. Simple, easy.