I thought the reverse flow water pump was used on the serpentine belt pumps, belt pumps all turn the same direction, but I could be wrong on that, something else I might learn.
With that said, if there is an overflow canister and it appears to allow overflow to go out and return with the same amount, check the flow across the top of the radiator to make sure it is good. Suggest turning the heater on full blast without the fan on to allow flow through the heater core (and release any air in there), some have a valve, some don't, also. Watch the flow of fluid with the cap off, it may take a few minutes for it to warm up, but you should see it flow across. If it doesn't it could be a plugged radiator or restricted flow through the radiator. If this is good, then, as said, ducting, or the stopping of air going around the radiator between the radiator support and the radiator edges top and sides will help ensure it isn't bypassing the radiator. The radiator cap itself can allow the temp to rise also, preventing the pressure from building properly, so take it a little bit through the paces, take the speed up higher than 60, say up to 75-80, see if the temp stays at 205. If it does she should be OK, if it keeps climbing and goes above 215, do the stuff noted above and what 68RT said, and the only last thing that would have her run a little warmer than you like is running the carb lean. How does the temp do running around in town? If it is up in town also, then start with the flow things and then go to the carb running lean. What carb and intake are you running?