If your Elco is a ‘79, then the engine itself would need to be at least a ‘79. My suggestion would be to try to find an ‘87-‘95 TBI 350. This would give you good driveability and cold-start performance, and they’re dead-nuts reliable. Only thing I’m not sure about is the hood clearance with the stock truck air cleaner.
However, there are some restrictions on swapping truck engines into cars. Long story short, they need to be in the same basic weight class. If the swap engine originally came out of a regular-cab, 2WD short-bed truck, you should be fine, but if it came out of a 2500, it’s probably a no-go, since there are different smog rules for HDs.
Yes, CA swap rules are a PITA, but as long as you stick to some basic guidelines, and show a good faith effort to follow the rules, you should be OK.
Also, any bolt-ons like heads, headers, intake, etc, will need an EO number, or be factory equipment.