[Newbie vent question]

I received a new kiln as a gift...Olympic 1414HE.  Firing box is about 1.4 cu ft.  Vent kits are REALLY pricey, so I'm putting one together.  I have a question about the blower motor.  The Orton vent kit (recommended for this kiln by the manufacturer) comes with a 73 cfm motor.  The Skutt kit comes with a 140cfm motor.  Does any one have an opinion on which blower motor might do the job?  Thanks in advance.

[Paragon A88B question]

Thank you Neal

[Paragon A88B question]

I am new to clay firing.  My teacher gave me a used Paragon kiln.  I will be checking it for lead residue, and I have another question:  The Instruction and Service Manual said these come equipped with a PROP-R-VENT latch used for venting.  Mine does not have this.  I see they are available to purchase, my question is wether this is necessary.  Thank you for any info.