340 x heads hi po manifolds install question.

Done it many times, jack motor up a bit. Be careful of distributor cap possibly hitting firewall or wiper motor. Also be careful of fan hitting fan shroud. Done it with and without power steering. Due to the shape of the exhaust port. I use “Flatout Gaskets” graphite manifold gaskets. They seal very well and I have been able to reuse them multiple times with no issues.