Flat tappet's cheaper. I tend to say either go solid roller, bush the block, and get all the benefits for the expense, or just run a flat tappet. IMO hydraulic rollers are too much for too little. I like the XE line in general. Cam size will depend on the rest of the package so any info you can add on the rest of the combo would be helpful.
The crank and rods are stock and the pistons are 30 over flat tops. I am thinking about putting larger exhaust valves and having the heads ported and polished. I'm not sure about the intake and carb yet. Opinions welcome..