Bob, I picked up a generic fan at the local PepBoys several years ago and just run if off a toggle switch, can also be run by a theomostatic switch. I will try to find the brand name and get back to you.
Assuming your 235 is the most common style (2nd series) with the water pump lower in the block vs the early style with water pump up under the thermostat housing,
Note: my 46 only boiled over in the summer time and mostly in traffic also I'm running a radiator from a 2 ton truck, a giant compared to the half ton rad. During nice weather I do not need to switch it on.
This is the brand of fan I used, link to Summit racing. These come in several sizes, get the fan that fits your radiator best. I mounted the fan up high to the front as a pusher, a puller may also work by itself, may need to remove the stock fan for clearance.
https://www.summitracing.com/parts/...-_-shopping-_-srese2-_-hayden-automotive 
