On my '78 I have the torque bar from 203 to the bell housing. Does the 205 have such a thing? Or does it just mount tot the cross member
If you would like to use a side torque bar/brace ( like your TH350/203 had ) you could get a side brace/bar from a 81~84 K-30 that came with a 465/205 set up - same dimensions from attachment point on the 205 to the proper bell housing bolt location as your TH350/205 has.
If your 205 is not drilled the boss is there on all GM 205’s and can be drilled.
One of these bars is a great idea on any automatic trans but especially on an older thin casting TH350 case - use one if at all possible because they do a wonderful job of keeping everything in place and happy happy happy.
Just as a note: not all 205’s after 1980 came with a slip yoke rear output. The regular long bed fleetside 131.5” wheel base trucks did but any K-30 that came with a carrier bearing equipped rear driveshaft ( such as Crew Cabs, Cab Chassis ) came with a rear bolt on yoke.
Just did not want ya’ to skip over any potential purchases because ya thought all were a certain way after a time period.
As for your question about which front output to use and which is stronger - the square flange style fit a Saginaw style cv-joint and the output shaft is 30 spline while the yoke style front output was made for a Spicer style cv-joint and the output shaft was a course 10 spline that was slightly smaller in diameter than the 30 spline shaft.
The Saginaw style cv-joint does not have a lot of tolerance for more angle than OEM set up - could be ground and clearanced but life expectancy goes down.
The Spicer style cv-joint puts up with a little more angle as is.
As for the front output shaft size difference the 30 spline is stronger ( could also up grade to the 32 spline shaft too ) than the 10 spline shaft but if you are still running a 1310 series front driveshaft than don’t worry about the transfer case shaft breakage - most likely even the smaller 10 spline shaft will outlive a stock front driveshaft.
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