The TFS heads come up a little short of 70cc.....not quite 70, usually around 69.7-69.8.
To answer your question, typical block deck height is ~10.170".
The order of importance is to first square deck the block so that the decks are straight, flat, and parallel to the crankshaft centerline. It may take .005" to do that or it may take .020". I would get your block machined correctly first, then see what you have to work with.
To get to a 10.5:1 compression with a 4.080" bore and a 4.250" stroke, with a TFS head, typical head gasket, and the pistons at zero deck, you need a 15cc-16cc dish.