Dads 64

Hello All
Thank you for this opportunity to interact with like minded people. I have never joined a forum of any kind, so I hope I don't mess up too much. Having said that not even sure how much info to share, I'm in my mid 60's and have been a car guy all my life, my father was a red seal mechanic and my youngest son is one also, dad dissuaded me from the profession but nether the less I have always done 95% of all mechanical work on my cars. I inherited my Dads 1964 Valiant V200 225 six last month, it was his dads car bought new and has only 37k on it. The cars body and interior are immaculate , It is suffering some pretty significant mechanical issues from sitting too long. I hope to restore this car enough in the short term to drive it from Toronto to Calgary were I now live. Long story short started the car after several years ran like crap, went through normal fixes to finally discover two intake vales have seized bending the push rods, no Biggy if it weren't for the fact that on the lifters popped out allowing a push rod down between the cam and it wont come out, so I'm tearing it down of course. So my first and I'm sure not last embarrassing call for help is I cannot find any info on the small bolt size of the vibration damper bolt holes for my puller, I think it is a 3/8-24 but as I am in a rural part of Ontario not my reasonably equipped garage at home in Calgary these little things waste a lot of time with trial and error, so any help would be great.
Thank You