Agreed on the rare beast...so don't set the bar too high....
you might find something on facebook or ebay but probably not what you want.
about the only other alternative is to call one of the custom cam grinders and see if they have a blank they can grind for you...and then rebuild what you...
assuming the flame arrestor cover is original to the engine, the XL says its a 1992 or later built engine...the U-shaped oil cooler suggests it is a big block vs a small block...so most likely a 454CID. Given the orientation of the exhaust, it appears to have a V-drive so it likely has the...
make sure the throttle plates are closed - probably quickest to just remove the remote cable at the carb...and then make sure the carb is mounted snuggly and the gasket is in good shape...no vacuum leaks...
for the next time...you can buy the bearings at any good bearing supplier...the seals may be available at another source but I never found a viable one...get the numbers off of the new one...
A hydraulic press makes the work described pretty easy...the hubs typically press on and off...just measure the shaft exposure and write it down before removing the hub...make sure you load the bearing races properly...not paying attention them can ruin them...
May be worth the effort to get a vacuum gauge and make sure that there are no leaks....
And 2X the recommendation on the service shop used previously...
Agree w/ KGHOST that the diagnostics may not have been explained in sufficient detail...
That said, assuming you are going down the path of replacing the TB-V distributor with a Delco EST kit, the directions in the EST kit are pretty clear about what changes need to be made. most of the wires...
that part number is for the Tbolt V ignition module, not a MEFI-x ECU...
If you change out the originial distributor for the Delco unit, you won't need the 861253-1 module...
who published the manual you are using?
Which ECU do you have ? (Ideally get the GM part number from the back of the ECU.)
what is your reference when you cite "wire #x"?
Do you plan to remove the ECU or leave it (partially) connected?
FWIW, there were many configuration changes in the late 1990's due to the GM production line...
I don't have any original literature that will yield a date.
what I do have says the 289CID blocks were delivered in four different options, from 165 up to 210 HP...and since that doc has a zip code in the address, its mid 60's and later...that said, there in nothing in it that aligns with your...
a lot depends on what "HEI Distributor" was used...assuming the shop you used to perform the work is reputable, they should resolve the issue for no additional funds...unless they told you beforehand...