273, or 318?

i'm with you there. exception to the rule is that hemi's can go in anything and european cars are fair game. i'm about to start on a volvo 142 that's getting a 2.3L eco boost motor for a client. should be fun!

i always like seeing stuff that would be "period correct", like a kid got a 10 yr old car and snapped in motor from something that would have been current then. say something like a 56 plaza with 273 commando/4spd or 413 wedge and an art carr bang box 727.
For the 142, I would be looking at a Volvo 5 cyl turbo. I am not impressed with the eco boost reliability. Manufacturers casting turbo exhaust into the head. I believe it leaves too much heat in the head leading to head gasket and cracking issues. I read Stellantis is working on casting the turbine housing into the head. I can read screwup coming.
Another good fit for the 140 series and 240 series Volvos is the SBF especially with aluminium heads.