A unified UAR from the Persian Gulf to the Atlantic would be an impossibility. Too many powers, both within and without the Arab World, oppose it.
If he
does manage it, however, he should probably sign up for the lottery several; he's the luckiest man to ever exist

Or maybe not; he's tempted luck enough already
Okay joking aside...
Congrats, he now has to manage the fourth largest nation on Earth, after the USSR, Canada, and the USA. There's more landmass in North Africa alone than the entirety of Europe. He's also going to rule over more than 150 million people in 1970, putting him in the top 10 populations easily. He'd have to invest heavily into education, training, and infrastructure to make it work properly. But assuming he even manages a decent standard of living and production, he's a powerhouse. While he'll never challenge the USA in terms of raw industrial power, he can still find a place among TTL's equivalent of BRICS. The existence of the uber-UAR is a gamebreaker in the Mediterranean; the UK and France have better navies, but the UAR has a presence through sheer size and coastal area.
He's not a nuclear power, but very certainly an economic one. Oil revenues alone would make his country among the richest on earth. Between the Gulf states, Iraq, Libya, and the Algerian gas, he practically
becomes OPEC, with Iran, Venezuela, and a few hanger-ons. He also has a considerable mineral wealth throughout the country, such as Egyptian copper and Jordanian phosphates.
And that's just the start.