Studs vs Bolts
I would say studs are a good choice .. espeacially if you are using an aftermarket block that the studs do not go into the water jacket.
I have sbc with studs .. but i have to say i did have an issue with the studs seeping coolant. It was an assembly issue...and the motor was new. I had to remove all the studs one at a time and reseal them..since then i have had no issues.
I would suggest Loctite 567 for sealing stud treads.. its a very stout thread sealer.. although its expensive it WORKS.
Take Care
Keith