To add to Art's comment that the 510 ECU will substitute for the 503, I pulled a 510 from a 1984 240, and swapped it for the 503 in my early-production 1983 240.
No difference in engine operation...starting, running, fuel economy, etc...so I've left it there and have the 503 in the trunk as backup. 19 years now. But I did have to replace the failed original -2 AMM after 29 years and about 170k miles. Was lucky to find two, so one on the engine and one in the trunk.
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Son's XC70, daughter's XC60, my 83 244DL, 89 745 (Chev LT-1 V8), and XC60. Also '77 MGB with Chev V6, and four old motorcycles. Long gone: 1981 244, 1994 940,1998 S90 and 2010XC60 (totalled by hitting 500lb elk)
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