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I have tried it both ways. Yes there is a procedure that allows you to install without removing the oil pan. You cut off the tabs from the rubber oil pan seal. It didn't work for me... Leaked like it wasn't there. I ended up removing the oil pan and starting over.
For me it is worth not even going there. I would remove the oil pan and do it by the book.
The front cover should be installed without the seal. You push the bottom of the cover down against the oil pan first, then push it up against the block. If the seal is in place, this is almost impossible to do.
If the seal is already in place, the only way to do it is to drop the oil pan a little.
My truck is a '53. I have a rear sump oil pan, but I cannot remove the pan without jacking up the motor because of the Mustang II IFS. I could loosen some bolts to get some slack, but I think that I'll try removing the seal and installing the cover. If I have to buy another seal, that is OK considering the alternatives.
it can be done. you have to trim the tabs as mentioned earlier, i trim the oil pan seal tabs a bit also. use the sillycone in all the right places and it'll seal. i haven't had one leak yet. test fit the cover without the oil pan seal to make sure you have the tabs trimmed off good. clean and degrease with carb clean around the inside areas where the seal is and dab some sillycone around in there too. the trick is to apply enough down pressure to get back on the dowels. maybe a couple of 1/2" drive extensions in the water pump passages will give you some ooomf? BTW, every chrome cover i've ever seen leaked. the smoothness of the chrome will not seal. you might want to scratch the sealing areas. anti-freeze on chrome? good luck!