Stan: that's a really nice looking '73!
1973 was a record breaker in sales for Olds, second only to '77 iirc. Olds was # 2 or 3 after Chevy in those years, and it's still hard for me to believe the idiots at GM shut it down just a year or so after their 100th Anniversary! '73 was the last really good running year for Olds, and a lot of US cars for that matter, after that they were emission strangled, thirsty, and finicky, until FI and other technology was applied to good effect some years later. Sounds like relatively minor issues on your '73, and as far as leaks go, of the 7 or 8 Olds & Mopar convertibles we've had, ALL of them leaked somewhere! Inside storage and dry day drives are the answer for the particular.
Allen, yes the 307 was sort of notorious for being a bit of a dog power-wise, but on the plus side they are strong as a brick sh_thouse and can go just about forever, a highly under-stressed and over-built engine. There are some fairly easy tweaks you can do to open her up powerwise, but depending on your state regs they may or may not be entirely legal to do. Those were real workhorses, a staple from 1950s to 80s.