I was at an antique tractor show and saw a 1989 with Banks I/C installed.

I never thought to notice the grille difference.

No one was around the truck to ask questions.

One thing for sure, I could see the intercooler, behind the grille, from quite some distance away; it was quite noticable.

 

Hellmannperformance.com
He's in Texas.
Shop 361-960-2217.
Mention me and he will know what your talking about.
I had mine made with custom 3.5" inlet and outlet. I think the core is 31"x15"x2.85". With this height, you will need to trim the hood latch and/ or relocate.
I did retain my A/C. Just pushed the entire assembly out about 1 1/2".
He should have a copy on file for intercooled trucks.
Although I can bury the inlet pyro over 425*, I have never been able to get the outlet side over 125*.
It is 99% of the time 5-10* over outside air. The Banks cooler was 5-80* over.
IMO, if your making 325 uncorrected RWHP or less on #2, the others are fine.