[The Rocknrod]

Here's a 350 from GM for 2K - https://www.summitracing.com/parts/nal-12681429
Same one - https://sdparts.com/i-19928423-gm-en...xoCEc0QAvD_BwE
The next level up from GM at 290HP is $2700 and some change.
There is Blueprint Engines also - https://blueprintengines.com/collect...rice-ascending