wrote

A pole barn is hard to beat for ecoomy and utility.

Agreed.

You might
consider beefing up one or two roof trusses so that you can use
a block and tackle or chainfall for an engine hoist.

Naah. You never beef up the ones in the right place. g

Really, if you put a stiffback (a couple 2 x 8's and a 2 x 4, nailed
together to make a "U") across 3 or 4 of the trusses (to share the load) a
temporary hoist of even a considerable weight will not damage the trusses,
at all.
--
Jim in NC