make sure u have the proper size battery too. PO had a dinky battery in mine when i changed it to the group 49 i noticed much much faster crank times and basically made my car startable down to 0F (so far this is the coldest i have had to start) where as before i strugged at 15F or so. faster crank=better compression (?)

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05