The Hollander manuals were the "bible" when it came to knowing what other vehicles parts would fit and work on older vehicles,they even had some footnotes on some parts saying "this number part will also work if you modify this or that"...but we found many things at the junkyard that would also fit and work they made no mention of,or required just a bit of fiddling to get it to work too...on todays cars when you need the exact same year and model vehicle or else parts wont fit or work,or even ones identical can vary due to different emission packages in different states,the interchange manuals might be wrong more often than right in many instances...its hit or miss compared to the old days...
Often an engine for example,will fit and work for several different vehicles and years,but to install it in YOUR vehicle will require both engines to be stripped down to the bare block and your injectors,wiring harness,upper air intake and sensors to be reinstalled into the "new" engine,which is a hell of a lot more work than in the old days...its not plug and play like it used to be...no wonder many mechanics found other jobs after the 1990's!...
I've seen engines get stripped and prepped like that more than once,only to find out when they go to install it ,its missing an important bracket boss or bolt hole,etc,creating a big headache...friend ran into this on a 3.1 GM recently,when the car ,a chevy,needed a engine and the salvage yard sold him one from an Oldsmobile ,that had the least mileage,etc...went to install it and found some things had no bolt holes where they needed to be...also has had engines for "california emissions" end up having many different parts like exhaust manifolds,etc too...so be sure what you buy will work before you get too deep into it!..