I'd consider building/buying one of those lower engine cradels (when I hear "engine stand" I am thinking something that has the engine sitting 3 feet in the air)... I have one I bought, and built two out of wood and casters... Strudy enought to support the engine, easy to roll around (when cleaningth garage, etc), yet less prone to tipping over (got any kids around?)...
Generally, you will need 3/8" course thread bolts. These will fit the motor mount holes and the bellhousing flange bolt holes...
I'd measure the "thickness" ofthe engine stand arms, and try to get 1/2" to 3/4" longer bolts and washers. Want to be sure you have plenty of thread engagement... Storage, Grade 5 hardware store bolts should be fine... I use Grade 8, just because its a little better. and whats a few cents extra?..