I have fitted a hot power point up near the power brake, copied from a Porsche example.
The brown lead on the right goes to the main battery connector on the starter, the two red leads come from the 90A alternator - pretty robust unit. Since the Porsche battery (928) is under the spare in the boot, this post is the official jump start connection, so its current capacity is high.
Advantage is the bakelite base is mounted to the inner wing, the metal post threads into a captive M6 nut inside the bakelite, and there is a screw on cover that protects against accidental shorts. Its tapped off the big feed to the light switch from the shunt, protected by a 40A resettable breaker. I am feeding directly to the off side headlight relays , and another lead goes across to the nearside headlight relay set. Easy to undo, and add a new tap with a ring terminal.
Anyway, the point of my rant/ramble is that hot points (that are safe) up near the front of the engine bay are VERY useful!
Also, re radiator size , this link may be of interest.
What size radiator do I need for my car? - Super 7th Heaven
I have also seen some tests (Sunbeam Alpine US club) indicating the importance of closing the gap between the bottom of the radiator and the front crossmember to prevent air recirculating through the gap and around to the front again in slow traffic.