Installing an MGB motor in an MGA

[john w murphy <murphys-law@worldnet.att.net>]

I'm planning on putting an 1968 MGB 5 main motor in my 1959
MGA roadster. I'll be keeping the MGA transmission, but using
an MGB clutch.
I want to install headers but I am not sure what combination
of headers and exhaust would be best/possible for the conversion.
If anyone has done this conversion before can they suggest
some header/exhaust combinations that will fit.
Thanks,John (Duxbury,MA)