Water pump question

[dzbowtie]

Currently working on initial start up of a 638 1-piece rear seal block, oe roller cam set up. Upon the initial start up, my temperature gauge read hot (230-240) I just wanted to make sure that this block did not require a certain flow water pump. I installed a standard long style water pump, pic attached. Heads are aftermarket vortecs set up to run with the roller cam. The temperature sending unit is attached to the driver side head, which I also replaced (I’m wondering if it is compatible with the original equuis gauge I have in the cab).

The temperature was read prior to dialing in new carburetor and distributor timing. When I saw the gauge I turned the engine off.

When it first fired up, the only coolant I had was in the radiator, 50/50 mixture. Once it cooled down enough to remove the radiator cap, I had to add more to top it off. It appears that what was originally in the radiator has cycled into the engine.

I appreciate any information I may be missing.