New fuel pump won’t idle

Big block pumps are short armed and use a pushrod. Small block pumps are long armed and run right off the cam lobe. You knew that.
Yeah that's right. I forgot. ....and I shouldn't have, because I'm getting ready to mod a big block pump to work on a slant 6. If it works, and it will, that'll be a good how to for our slant 6 brethren. In looking, there ARE small block pumps with different shaped arms. "I GUESS" all that matters is that last 3 or so inches is at the correct angle.