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Keep the old engine as a spare if you get a new one dropped in. When you have a spare, the primary is less likely to blow and if it does, you have a running engine ready to be swapped back in to get you back on the road.
I agree with Frank tho. No sense replacing it just because you have too much money in your pocket. If the old one keeps running; keep running it.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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