67-72 Engine Perches into 62 C10 - L & R ?

[bhap]

Would like to confirm that this is the correct installation for the 67-72 V8 engine perches going into my 62 C10. They seem to fit better this way but I've looked at so many different pictures, I'm not sure which is left or right. Installing with a manual transmission V8 bellhousing so I'll have a "4 point stance". It looks like I'm going to need 1/2" or 5/8" spacers - should these be the same on both sides even if there is a small difference between sides? Right now the front of the block is resting on a V8 horseshoe mount. Going with a serpentine belt setup and power steering or I'd just use the horseshoe.

Should the nubs circled in the pictures go towards the back of the truck?

Thanks for your help.