372or 416 and why

Actually it was $89 for the comp springs and another $40 & $16 for the locks/retainers so about $833 + an hour of my time, not theirs.

So your $1643 minus my $833=$810 difference.

BTW what your saying will cost $1917+tax at your shop, give or take, just incase more needs to be done.

And thats if you can get those eddys to your door for your price of $1469+shp

Regardless of this earthmover, do what makes you feel good and gives you the desired outcome.
This only equates to the fact that you can get what you want either way and depending on your resources can get away with it pretty cheaply.

Pretty much how much do you know about engines and cylinder heads along with how air moves through a port.

I'm just offering another way, nothing more.
Good luck.