Thanks for all the replies. I took the tripod into a local camera store and the folks think its a genuine gitzo, but still don't know what model it is. Going to follow up with Vitec based on the serial number.
I'll take a look at the Realy Right Stuff heads. I saw the Gitzo GH2750QR is greatly discounted at https://smile.amazon.com/dp/B0013J02OQ/?coliid=I3U5JPLHW1QT0E&colid=1RDIBBRXVOKI6&psc=0&ref_=lv_ov_lig_dp_it at $160. Given the price, is there any reason to consider it? Everything I've read confirms that Gitzo heads aren't great, but then this tripod is going to get lighter use compared to the frequent use by photographers on this forum.