I totally ignored the fact that you were removing the motor when I talked about strapping it to the tunnel.
While that might work, I think it’s too far back.
My advice for a quick engine removal would be to definitely leave the bell housing on the transmission initially. Then use one of the top bolt holes, or a couple of them, and run a strap up to a board laid across the top.
I’ve done it by hooking a strap to the bellhousing, and just letting the other hook lay on the cowl under the hood.
That works great for the relatively lightweight stock three speed, but I’m not sure I trust it alone for a 435.