Though, I'm pretty sure I had it marked because those terminals are used in things like the turn signal switch, rear body harness, and center console... They look the same as what you've pictured. But...
'68 SS Camaro w/ a '66 427/425 28 year project and counting!
I guess you 'could' ...
Heck I've seen a guy closing a crimp with a vise
But using the correct tool will give the best mechanical bond and assure the strain-relief is correctly locked on the insulation.
I have seen these crimpers in stores for under $20 (I know, a lot to spend for something you don't think you'll use often) - I bought mine years ago at a "Bargain" price of just under $100 ... and I've seen them for twice that on some sites ...
Crimps look like this -
I use mine more often that I would even thought, specially because they will do most of the GM and others Packard style connectors.
Maybe you can just check around with a few shops in your area a find a mechanic that would be willing to do the crimps for you after you've got everything ready for a few $$ - worth a try anyway.
Other V8 things - some of which float
Other V6 things - none of which float
Oh yeah, and 1 "Straight-Six" ...
If a man says something in the garage - and his wife can't hear him - is he still wrong !!!