Nice work! There's not a whole lot I'm afraid of tackling but taking apart and resoldering a radiator is probably not a job I'd take on at this point without a lot more practice soldering other stuff and working with brass in general. Congrats on a job well done! Do you have any pictures of the gunk you got out? or was there a lot of it? Let us know how it runs!
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Aaron in T̶a̶c̶o̶m̶a̶ Meridian, Idaho
(although still a Montana hillbilly at heart

)
1931 Coupe
1931 slant window sedan