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I have found a replacement that Briggs recommends however it is not a direct replacement and would require some parts to be changed in order to work.
Complete engine replacement is a Briggs 126M07-5060-F1 which would require the following changes be made to work.
Service Note 88
Transfer Muffler and/or Spark Arrester Assembly from the original engine if suitable for additional service or add new parts as required
Part Removal Note
Requires that Part No. 690319 be removed.
Service Note 73
Transfer Flywheel Assembly to the replacement engine.
Part Addition Note
Requires that Part No. 691291 be added.
Requires that Part No. 691452 be added.
Requires that Part No. 691451 be removed.
Or you might consider shortblock replacement part number 590802 which you would just transfer your external parts and pieces onto to make work.