Pulling the engine is the way to go, trust me, its easy and no underside work, Most all is sitting on a stool ( might be difficult getting up), Ha,LOL!
Ok not so funny for us "recycled teenagers" (seenagers)
Do not try in frame cyl removal, it just is trying to pull yerself up by yer boot straps,--- ok worse than that.
When you remove the exhaust manifolds keep them attached to the muffler.
Mufflers are old and rusty and don't like divorcing the manifold spigots.
Heat the manifold nuts so you don't have to deal with broken studs
Also the pto clutch 2 top bolts/studs need dealt with to remove the muffler.
You will need 2 exhaust-to-cyl. gaskets when going back together.
Cylinders are RTV'd to the crankcase, no gaskets.
Heads to cyl do use head gaskets no reusing them and be sure to retorque after running on the bench, bring them up to temp 2X then retorquing, or you will be replacing then.
You can bring them up to temp with tins off, just don't get carried away.
Oh boy here I go again, you prolly know all this.
