I haven't had a Porsche engine up on my stand yet, but I use a factory/dealership Matra VW engine stand. I have yet to find an original pedestal (still looking) so I bolted it to my steel workbench, which I bolted to the floor. 3 concrete anchors in front and 3 in back. I could put in 6 front/6 back but I thought it to be overkill. The factory Matra yoke originally had 3 arms, but mine has had one cut off. The 3rd arm gets in the way anyways. I had a complete aircooled type 1 engine on the stand, and then I put my weight (190lbs) on it, and the only thing that flexed was the work bench. I will be welding an extra plate on the bottom of the stand for a little more durability, even though it is quite stout already. Its old and built well. The cheapie aftermarket VW stands (2 arms) are pretty cheap looking IMHO. I wouldn't even want to put a VW engine on one, although many many people do. But, I'm a sucker for originality, and tools too, so how could I settle for anything less than original factory tools? lol
btw.. I'm looking for a Matra engine stand clamp (the piece that bolts to the bench or pedestal) if anyone has one. I'd trade my vintage US 303 (I think thats the number) + cash for one. Also interested in other aircooled VW matra tools