058 = Friday 2/27/70 or Wednesday 2/27/80 or Tuesday 2/27/90 or Sunday 2/27/00

204 = Thursday 7/23/70 or Tuesday 7/22/80 or Monday 7/23/90 or Saturday 7/22/00

208 = Monday 7/27/70 or Saturday 7/26/80 or Friday 7/27/90 or Wednesday 7/26/00

'80 & '00 are leap years

rarely if ever are dates found for a Saturday or Sunday - the small pics look too good for typical 50 year old used carburetors (what does the rest of the engine compartment look like?) - I'm leaning toward '90