as for you gasket choice - who knows lol - i vote std gasket on wire rung block, std bolts. As long as who ever wire rings it has good experience of doing it and feels its a good choice - eg they have done lots and seen no failures from their own installation as i am sure the quality of job can vary amazingly given the process and how simple it seems!

but then again you are looking for people experienced with 350hp CVHs lol - what do tommy field and norris do?