overflow tank with 5.3 swap - how to route to radiator and steam port?

[paradigm]

I have an '86 Monte Carlo SS with a truck 5.3 LM7 swap. The prior owner installed a Mazda 3 overflow tank which seems to complicate things with the following:

A on the overflow tank goes to the high side nipple on the radiator.
B on the overflow tank goes to the low side nipple on the radiator.
C on the overflow tank goes to the steam port passing through the throttle body.

I want to simplify the setup with either the factory non pressurized monte carlo overflow tank or a Dorman 603-001 overflow tank.

I am going to re direct the steam pipe to the high side on the radiator tank.
I am going to use the blue nipple on the radiator tank to feed the monte carlo or dorman overflow tank.
I am going to cap the lower nipple on the radiator tank.

Should I replace the vented fill cap on the radiator with a solid one?

 

[Sweet_Johnny]

I'm unfamiliar with the swap but what you've laid out makes sense to me. I don't see an issue but might be missing something. As for the cap, that's up to you I guess. I used to run a vented cap but it's not a big help in any way unless you plan on removing it while hot. I just go for the highest pressure rating available to prevent boiling.