First, check for snakes (& other "vermin") in the barn,,,
Go ahead and remove IC (you need do this for clean-out anyhow), then look for some #'s & take pix for us to see,,
Double-check your 3.5" DP measurement--as that's a ****per & plenty-BIG for BIG goals (stock is 2.5"--& most step-up to just a 3.0"),,,
Remove turbo-shield & take pix of both sides for us to see (likely TA series per you earlier comment--2-bolt inlet bell/ like stock) and, as already stated, note any numbers on both compressor & exhaust housings,,,
Put a mini-fridge in your barn & stock-up w/ beer--you're gonna need it!
[So far, this does not appear to be a HUGE problem--turbo only!?]