I'd probably play it similar, with just top pair or an overpair I'd rather let the other player do the betting for me, since I probably can't make a bet or raise that a worse hand will call, yet my hand could still be good. His bets are all big though which makes it a tough hand. Maybe raise it to 80 or 100 on the flop to slow him down? If he makes another big bet or raise he almost certainly has AK beat unless he's crazy loose.