Thinking of getting a Milodon Oilpan 30908

http://store.summitracing.com/partde...5&autoview=sku

and after reading on milodons webpage
NOTE: For engines over 430 cubic inches or engines that see nitrous or blown use, the Extreme Duty pickup #18316 must be used.
http://www.milodon.com/oil-pans/stre...ns-sbchevy.asp

milodon pickup
http://store.summitracing.com/partde...5&autoview=sku

Why would I need to change it for my blown engine?

my current one can be seen here, maybe it doesnt fit, thn I have to buy one anyway..

http://medlem.spray.se/gta324/mods/e...pics/415sb.jpg