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My suggestion to you is to do all you can to stay with a replacement LQ1, if you choose to do otherwise you'll have to deal with the electronic side of the issue. For '91 the trans behind the LQ1 is the 4t60-e, now that may not seem to be much of a concern but the ECM in the car is programmed for the LQ1 & the 4t60-e. You look to drop in another engine of choice & now you have to reprogamme the ECM to accommodate that replacement engine. The mem-cal inside the ECM housing is specific to the LQ1 for that year & that trans.    

Thank you so much for the help 

If you care about originality and how the motor looks to be correct for a 1991 LQ1 car, you would want to stay within the 91-92 model year.  You can use a 93 motor as well but the dipstick and tube is the only part that is a lot of work to swap over. 1991-1992 Lumina Z34, (standard with the LQ1). 1992 Lumina Euro 3.4, (standard with the LQ1). 1991-1992 Pontiac Grand Prix GTP, (standard with the LQ1).  SE, GT, STE trim, (when optioned with the LQ1). 1991-1992 Cutlass Supreme coupe or sedan, (when optioned with the LQ1). ANY W body that has an X in the 8th place of the VIN will have the LQ1. Now...if you don't care about how correct the motor looks in the engine bay, you can go outside the 91-93 year range.  The 94-95 motors will work but you would have to do some swapping over of parts to make it look correct.  Some things are easy, some are not. The 96-97 LQ1's are dramatically different in appearance and functionality/engineering.  They will get you more power but again, lots of internal and mechanical differences.  These motors are also interference compared to the NON interference motors from 91-95. If you have any other questions, please ask us or you can PM me personally as I've gone in depth with these motors during my cars restoration efforts.  

Do a search on car-part.com for an engine for your 1991 Z34 Lumina. The search results will include years and models of vehicles with engines that are compatible with your Lumina.

My engine recently blew up, and I can’t find any engines for the car and I’m very stuck. I’ve done research but I can’t find anything so I thought I’d ask you guys for help. I need to know what cars have compatible engines. thanks